Paper
Universality of Unintegrated Gluon Distributions at small x
Authors
Fabio Dominguez, Cyrille Marquet, Bo-Wen Xiao, Feng Yuan
Abstract
We systematically study dijet production in various processes in the small- limit and establish an effective -factorization for hard processes in a system with dilute probes scattering on a dense target. We find that the well-known Weizsäcker-Williams gluon distribution can be directly probed in the quark-antiquark jet correlation in deep inelastic scattering and the dipole gluon distribution can be directly measured in the direct photon-jet correlation in collisions. In the large- limit, the unintegrated gluon distributions involved in other different dijet channels in pA collisions are shown to be related to two widely proposed ones: the Weizsäcker-Williams gluon distribution and the dipole gluon distribution.